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Re:Why “children,” not “childs”? (2016) by andrewbinstock on Sunday May 27, 2018 @06:44PM (#17169518)
The visa thing sounds like a back-formation unique to your mother tongue. The word "visa" is the past participle of videre (Latin for "to see"). So it is not a plural in its formation/derivation.
Re:Why “children,” not “childs”? (2016) by bmn__ on Monday May 28, 2018 @03:47AM (#17171128)
You're mistaken. The verb is vidēre, videō, vidī, visum.

There is also the noun vīsum, -ī, plural visa with the primary meaning the seen [thing], appearance, perception. This is the word that was borrowed into English and other languages.

Re:Why “children,” not “childs”? (2016) by andrewbinstock on Monday May 28, 2018 @09:27AM (#17172258)
Why not look it up before you assert someone is wrong? It's explained in detail in [0]. It's clear that visa is used as a past participle, not as a noun, and it's applied in the singular. There is no support anywhere for the use of visum as a singular and visa as a plural. Which is what I believe I said above.

[0] https://www.etymonline.com/word/visa